There were always certain things in my grandmothers house that were not even open but they would have the same after taste and it’s a very strange one. It’s kind of like old tasting and it sounds strange but kinda like refrigerator. Sometimes it was very strong and I don’t know what it is. She then moved somewhere else and it doesn’t go away. And o feel very weird everytime she gives me a snack or even a bottle of water cuz they have that taste. What could it be?